Rubber Double-Composite Sealing Strip Production Line

1. Working Principle Extrusion molding is a manufacturing process in which plasticizable rubber compounds are continuously forced through a die under specific conditions, thereby forming products with defined cross-sectional shapes. As the rubber compound moves forward along the screw, mechanical and thermal effects cause changes in its viscosity and plasticity, transforming it into a viscous fluid. Based on these changes during extrusion, the working section of the screw is typically divided into three main zones according to their functions: the feeding zone, the compression zone, and the metering (or extrusion) zone. 2. Cold-Feed Extrusion Advantages: It eliminates the need for heat‑treating equipment, facilitates mechanization and automation, and—thanks to the enhanced shearing and plasticizing action of the screw—produces rubber compounds with uniform temperature and consistent plasticity. This improves the quality of extruded products, enhances surface smoothness, and ensures that semi‑finished extrudates maintain stable, consistent dimensions. Additionally, cold-feed extrusion exhibits low sensitivity to pressure fluctuations, offers broad applicability and high flexibility, and requires lower capital investment and operating costs compared to other extrusion methods. 3. Equipment Features This equipment is suitable for extruding various types of rubber, including EPDM, natural rubber, nitrile rubber, butyl rubber, and reclaimed rubber. It is used to produce composite sealing strips for building doors and windows, single‑extruded sealing strips, as well as dense and foamed rubber products in diverse forms such as tapes, strips, tubes, and sheets—for applications in construction, electrical appliances, machinery, water management, and more. Cold‑feed rubber sealing strip extruder: This type of equipment uses cold rubber feedstock and generally employs forced cold feeding. Its key characteristics include high production efficiency and stable output. Extruders are commonly employed to manufacture sealing strips, rubber hoses, and other products that can be produced via extrusion processes. They are specialized rubber-processing machines designed for producing tread compounds, inner tubes, rubber hoses, and various shaped rubber profiles.

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Rubber Double-Composite Sealing Strip Production Line

1. Operating Principle

Extrusion molding is a manufacturing process in which a plasticizable compound is continuously forced through a die under specific conditions, thereby producing a product with a defined cross-sectional shape.

As the rubber compound advances along the screw, its viscosity and plasticity undergo changes due to both mechanical and thermal effects, transforming it into a viscous fluid. Based on the material’s behavior during extrusion, the working section of the screw is typically divided into three distinct zones—feeding, compression, and metering—each serving a specific function.

2. Cold-feed extrusion

Advantages: It saves on hot‑melt processing equipment, facilitates mechanization and automation, and, thanks to the extruder’s enhanced screw shear and plasticizing action, ensures uniform temperature and plasticity of the compound. It improves the quality of extruded products, enhances surface finish, and produces semi‑finished extrudates with consistently stable dimensions. Cold‑feed extrusion is less sensitive to pressure fluctuations. It offers broad applicability and high flexibility, while requiring lower capital and operating costs compared to other extrusion systems.

3. Equipment Features

Suitable for extruding rubber compounds (EPDM, natural rubber, nitrile rubber, butyl rubber, and reclaimed rubber), it is used in the production of composite sealing strips for architectural doors and windows, single‑extruded sealing strips, as well as various dense and foamed rubber products—such as strip‑shaped, bar‑shaped, tubular, and sheet‑like items—for applications in construction, electrical appliances, machinery, water conservancy, and other fields.

Cold-feed rubber sealing strip extruder: This is a type of equipment that uses cold rubber in the production process, with feed typically employing forced cold feeding. Cold-feed rubber extruders are characterized by high production efficiency and stable operation. Extruders are commonly used to manufacture products such as sealing strips and rubber hoses that can be produced via extrusion. An extruder is a rubber-processing machine designed for extruding tire treads, inner tubes, rubber hoses, and various rubber profiles.